Gas Detector Sensors • Catalytic diffusion sensors detect combustible gases and vapors by wounding wire into coils doped with catalysts. • The sensor is connected to a Wheatstone bridge, detecting changes in resistance. • The active element burns the gas, increasing its temperature, while the reference element remains unchanged. • The sensor must be intrinsically safe to prevent ignition in a combustible atmosphere. • Electrochemical sensors detect and amplify the current causing gas diffusion, displaying gas concentration in parts per million (PPM) for toxic gas sensors and percent volume for oxygen sensors. • Pressure gauges should be made from compatible materials or fitted with a diaphragm seal to extend their life cycle. • Regular training on proper handling and installation can limit the risk of mishandling. • Pressure gauges can be managed by standardizing them, conducting a full pressure gauge audit, and coordinating employee training.